CVE-2026-24425 — Vulnerability in twig/twig — CVE Details

# Description When using the sandbox with a `SourcePolicyInterface`, Twig does not always apply the sandbox restriction that forbids non-`Closure` callbacks for callback-accepting filters. The issue affects the `sort`, `filter`, `map`, and `reduce` filters. In the affected versions, the runtime check that rejects non-`Closure` callbacks in sandbox mode does not use the current template `Source`. As a result, when the sandbox is enabled through a source policy instead of being enabled globally, Twig can incorrectly treat the current execution as non-sandboxed for these callback checks. This can allow user-controlled templates to pass arbitrary PHP callables to callback-accepting filters even though the template is being sandboxed through a source policy. The issue happens when all these conditions are met: - The sandbox is not enabled globally; - A `SourcePolicyInterface` enables the sandbox for the rendered template; - The template uses one of the `sort`, `filter`, `map`, or `reduce` filters; - The callback is not a `Closure`. # Resolution The patch makes callback sandbox checks source-aware by propagating the current template `Source` to callback-accepting filters and using it when deciding whether sandbox restrictions apply. # Credits We would like to thank XavLim and Wade Sparks for reporting the issue and Fabien Potencier for fixing the issue.